織構(gòu)，而bcc β-Li相中則形成{110}<101>織構(gòu)。擠壓過程中，LAJ932鎂合金的強度和塑性均得到改善。擠壓態(tài)Mg-9Li-3Al-2.5Sr(LAJ932)合金的抗拉強度達到235 MPa，屈服強度為221 MPa，延伸率為19.4%，合金展現(xiàn)出良好的力學(xué)性能。"/>

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Microstructure and Mechanical Behavior of a New α+β- Type Mg-9Li-3Al-2.5Sr Alloy
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Microstructure and Mechanical Behavior of a New α+β- Type Mg-9Li-3Al-2.5Sr Alloy
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National Basic Research Program of China (2007CB613702); International Scientific and Technological Cooperation Projects (2010DFR50010)

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    摘要:

    采用傳統(tǒng)鑄造方法分別制備了Φ10 mm和Φ90 mm Mg-9Li-3Al-2.5Sr (LAJ932)合金錠。在擠壓溫度260 ℃，擠壓比28條件下對Φ90 mm合金錠進行擠壓。分別分析和報道了鑄態(tài)和擠壓態(tài)LAJ932鎂合金的微觀組織和力學(xué)性能。探討了該合金在擠壓過程中的組織演變規(guī)律。研究結(jié)果表明：鑄態(tài)和擠壓態(tài)LAJ932鎂合金均包括α-Mg (hcp)相，β-Li (bcc)相和Al4Sr相。Φ10 mm鑄錠的組織比Φ90 mm鑄錠組織細小得多。擠壓過程中α-Mg相發(fā)生連續(xù)動態(tài)再結(jié)晶，而β-Li相發(fā)生非連續(xù)動態(tài)再結(jié)晶。擠壓過程中，在hcp α-Mg相中形成{100}<100>織構(gòu)，而bcc β-Li相中則形成{110}<101>織構(gòu)。擠壓過程中，LAJ932鎂合金的強度和塑性均得到改善。擠壓態(tài)Mg-9Li-3Al-2.5Sr(LAJ932)合金的抗拉強度達到235 MPa，屈服強度為221 MPa，延伸率為19.4%，合金展現(xiàn)出良好的力學(xué)性能。

    Abstract:

    The as-cast Mg-9Li-3Al-2.5Sr (LAJ932) alloy ingots with diameters of 10 mm and 90 mm were prepared. The extrusion of Φ90 mm as-cast LAJ932 alloy ingot was carried out at 533 K with an extrusion ratio of 28. The microstructure and the mechanical properties of the as-cast and extruded LAJ932 alloys were discussed. The microstructure evolution during extrusion was analyzed. The results show that both the as-cast and the extruded LAJ932 alloys contain hcp α-Mg, bcc β-Li and Al4Sr phase. The grain size of as-cast Φ10 mm specimen is smaller than that of Φ90 mm specimen. The microstructure evolution during extrusion is governed by continuous dynamic recrystallization (CDRX) in α-Mg phase whereas discontinuous dynamic recrystallization (DDRX) occurs in β-Li phase. {100}<100> texture is formed in the hcp α-Mg phase whereas {110}<101> texture is formed in the bcc β-Li phase during the extrusion process. Both the strength and the ductility of the LAJ932 alloy is improved by extrusion. The extruded LAJ932 alloy shows a favorable combination of the strength and the ductility with the tensile strength of 235 MPa, yield strength of 221 MPa and the elongation of 19.4%.

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楊 艷,彭曉東,謝衛(wèi)東,魏國兵,許 峰,魏群義. Microstructure and Mechanical Behavior of a New α+β- Type Mg-9Li-3Al-2.5Sr Alloy[J].稀有金屬材料與工程,2014,43(6):1281~1285.[Yang Yan, Peng Xiaodong, Xie Weidong, Wei Guobing, Xu Feng, Wei Qunyi. Microstructure and Mechanical Behavior of a New α+β- Type Mg-9Li-3Al-2.5Sr Alloy[J]. Rare Metal Materials and Engineering,2014,43(6):1281~1285.]
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  • 收稿日期:2013-06-13
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